71906 CD/PA9ADBC
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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71906 CD/PA9ADBC Bearing Product Overview & Core Advantages
The 71906 CD/PA9ADBC is a precision duplex angular contact ball bearing designed for applications requiring exceptional rigidity and accuracy. This matched back-to-back (DB) arrangement is preloaded to Moderate / Class C specifications, providing superior stiffness and rotational accuracy. It excels at handling combined loads (radial and axial) simultaneously, making it ideal for high-precision, high-speed machinery where minimal deflection is critical. The use of a phenolic cage contributes to its high-speed capability.
71906 CD/PA9ADBC Bearing Model Code Explained, Specifications & Naming Convention
- 71906: Basic designation for a high-precision angular contact ball bearing series with a 30mm bore and 47mm outside diameter.
- CD: Indicates a duplex pair in a Back-to-Back (DB) arrangement.
- PA9A: Denotes a very high tolerance class (equivalent to ABEC 7 / P4), ensuring extremely tight dimensional and running accuracy.
- DBC: Specifies the preload level as Moderate / Class C.
71906 CD/PA9ADBC Bearing Structural Features & Performance Benefits
This bearing's performance is derived from its specific construction:
- High Rigidity & Accuracy: The duplex back-to-back (DB) configuration with a moderate preload creates a highly rigid bearing system that effectively resists moment loads and minimizes axial and radial runout, ensuring precise shaft positioning.
- Superior Load Capacity: The 15° contact angle and optimized internal geometry provide excellent capacity for combined radial and axial loads.
- High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, allowing for a high limiting speed of 100,500 rpm. This cage material also offers good performance under marginal lubrication conditions.
- Precision Engineering: Manufactured to PA9A (P4) tolerance class with extremely tight bore, outside diameter, and width tolerances, guaranteeing consistent, high-performance operation.
71906 CD/PA9ADBC Bearing Typical Application Areas
The 71906 CD/PA9ADBC is engineered for demanding applications in:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes and Robotic Drives.
- High-Frequency Motors and Spindles.
- Medical Equipment and Optical Instrumentation.
- Aerospace Actuation Systems.
